Indicating-caliper.



F. W. HORSTMANN. INDICATING CALIPER. APPLICATION FILED JUNE 12. 1917.

1,300,837, Patented Ap1115, 1919.

WITNESSES.- I WINI ENTOR.

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FREDERICK WILLIAM HoRs'rMAivE, or KEARNEY, NEW JERSEY.

INDICATING-CALIPER.

To all whom it may concern Be it known that I, FREDERICK lVInmArr HORSTMANN, a citizen of the United States,

residing in Kearney, in thecounty of Hud- 'son and State of New Jersey, have invented a new and useful Indicating-Caliper, of which the following is a specification.

My invention relates to that well known measuring device forv accurately determin-.

ing size, thickness, width ;or length,and it consists in combining with it a means for indicating in such a manner that it becomes more useful and reliable than any other known gage or caliper.

It further consi ts of means whereby the sense of sight isfused instead offeeling as in the simple caliper and by the sight indication to fill a, neednot given by either the caliper or even micrometer. It also consist-s of the construction of its operative parts,

their adaptability, size, weight and form to make operative and useful :what might, be otherwise. I I

The object is-to make a new article of manufacture and a useful means in the hands of a skilled workman'to make his work easier and more certain of a good re-; sult by its use and to so make the parts that the-same is constructed as a complete article, salable, handy and satisfactory in'respects not. heretofore attained} In the drawingFigures land 2 are exterior views at right anglesto each other, Fig. 3 is an; elevation ot'the movable mechanism of the dial and Fig. 4: a plan of same.

In Fig. 1 ;is shown what is termed an and by the dotted lines it ismade clear how the same may be made outside caliper into aninside caliper. y y h A is ajointed beam conslsting of 3 861168 of parts riveted or bolted together-but for special uses this beam'm'ay be without any joints and madetoany required size or design; the jointed construction is fo-r making it an inside andoutside caliper.

This beam has for its extreme ends the points B and B upper and lower respectively, the said points being the contacts in taking size or measurement. It is by the beam that the user handles the article for it is intended and meant to be always applied to the work and not the work brought to it. The lower point B is at the end or apex of the adjustable screwl C, the said screw engaging screw threads through a part of the body at its lower end, which being bifur- 7 Specification of Letters Patent. Patented Apr, 15, 1919, Application filed. .Tune 12, 1917. Serial No. 174,248.

This bar has a limited scope of movement inwardly by the stationary pin acting as a stop to the said bar against a fiat surface contact as shown at F and in an opposite direction by the set screw G and the upper end of the bar. The pressure of the spring H is sufficient to overcome the light pressure of the spring a so that the bar E is in constant contact at the stop F when not in use.

A part of the bar is of lesser diameter to provide an annular space for the interposition of an open spiral spring H which presses the bar concentrically and in line with said bar against the stop, so that while there is a movement of the said bar in both directions, it is acted upon in the one and reacted in the other automatically simply by passing the caliper over the work as may be seen in Fig. 1.

I is a double segment gear, each segment in the same plane and of different radii, both having a common center at J and mounted upon a stationary stud J to oscillate thereon.

The toothed bar E engages the segment of least radius which gives an increased motion to the segment of larger radius to engage a pinion K.

shown in Figs. 1, 2, and 4 L. L. are screw holes through the case and into the body by which they are secured together in proper alinement for the engagement of the pinion K which is an integral part of the gudgeon M to whichis secured a helical hair spring N and the indicating finger O.

P is the dial case; the dial is pressed into the case. which has a central bearing for the gudgeon M so that the said bearing is between the springN and the indicating finger O, the other gudgeon bearing is at the end and close to the pinion K.

Transverse movement or end play of the gudgeon is prevented by the end near the pinion coming in proximity to the end of the bearing in the body; and av shoulder close to the back of the dial case. The outer end of the spring N is made fast to the stationary part a and a proper tension put into the saidspring so that whenin place all the lost motion ofall the gears is taken out, the spring N exerting its mild influence against the stronger pressure or influence of the spring H upon the stop at F; in this position the-indicating finger 0 is made fast upon the gudgeon pointing directly upward. It is apparent by the means herein described that the motion of the finger over the stationary dial is not only increased, it is multiplied and it is also to be seen that the scope of motion is ninety degrees more or less each side of a zero mark in equally marked divisions with a corresponding motion of the said fingerlalso eachside alike of the said zero mark and with the increase of motion obtained even with useofa shorter finger a steadier and more perceptible reading of the indication is gii' en and seen.

In the use of this indicating caliper let the supposition be to take a measurement and then to duplicate it. The measure is taken by bringing the points 13, B to the work see Fig. 1, and setting the adjusting screw C until the finger 0 points to the zero mark as shown on Fig. 1 on the horizontal center line at the left of the dial; on withdrawal the finger will move to its set upright position.

The work to be duplicated is now tried by passing the contact points of the caliper over the work and the finger moves automatically to a position past the zero mark being'plus therequired. size, the indication showin'osmall the finger will not move tothe zero mark and will show exactly how much it is too small. It is thus apparent that the sense of sight is only used and is made more reli'ablethan that of'feelin'g and with the multiplied,steady and exact movement alike either'plusor minus in automatic indication it has proved its utility it may also be" observed that owing to-t'hc' extrame lightness of the movable parts it is devoid of the bad results of inertia; and that it is pos sessedlof means for talring up its Wear by the construction shown.

The dial is stationary and protected by theordinary crystal Q- as is shown in Fig. 4 .7

The zero mark is shown and fixed at a certain point, the said point being at the tangent of a parallel" line to the axis of the contact points would be in touch with the circle described by the indicating finger. In

exactly how much too large; if too becomes useful; it is obvious for gooct results that the smallest finger be used and that the scope of 'IHOfiOH' be all that is possible, so

that it is imperative a full circle-should and must used t0 be inharmony with the oper'atiyeparts; '7 7 Havingdescribed my invention what claim as new and desire to secure: by Eetters' Patent is z- I v 1. As an article" of manufacture an Ind-'1- catmg caliper composed of a beam with an adjustably fixed contact point at" one end and at the other a means'to operatefrom' a movable contact polnt't'o move'an Indicating fingerup'ona dial; said means" consisting of" a toothed rack,

of motion.

2; As an article of manufacturean India double segmentgear and V pinion all in engagement in the same plane 7 eating; caliper'co'mposed' of a beam"w-ith an adjustably fixed contact; point at one end", and a means to carry a. movable contact point at the other, conne ting, mechanism therefrom to a pinion all moving in the same plane thesa'idi pinion, a helical spring and an indicating finger all rigidly attached? so as to be relatively operative.- 1 I; 3. The combination in an indicating caliper'with a beam having an ad'jnstablyfiz'ied terminal point and anoth'er'operatively movable in both directions; of a circular dial with a centrally mountedjgud'geon beam", the said gudgeon provided with an in'dic'atii1g finger and means to make its exactindication at a point ne fli'e i said beam, a helical} spring secured to said :gudgeon and said per with a beam having t rminal contact points, one adjnstably' fixed and; the other" automatically movable; of a multiplying and connecting mechanism therefrom to a dial finger consisting of a toothed bar'engaging the teeth of a mounted double segment gear on its'lesser'radius and said gear engaging a pinion on: its-greater radius, the

said pinion moimted with the" said: finger upon thesai'd Beam and said mechanism all moving in'thesameplane. U 5. The combination in an" indicating calipet with a beam having-terminal points;

one of which is 'ad'ju'stably fixed the other automatically movable in Both dire'c- Q tions; of concentrically pressed tooth bar,

a Inounteddouble segment gearofdifi'erent rad i, a mounted gudgeorr with an integral pinion, an mdicating finger and an open ,mova

per with a beam provided with terminal contact points, the one adjustably fixed and the other automatically movable; of means for taking up wear and lost motion consisting of connecting mechanism interposing a stron centrally placed spring upon the said ble point and a weak spring axially secured to the gudgeon carrying the indicating finger.

7. In an indicating caliper a beam carrying two contact points the one having means to make it adjustable and positively fixed and the other independently movable of the said beam, in combination with means to hold the said movable point to a determined position, connectin mechanism therefrom to a finger, the sai finger indicating upon a dial mounted upon the said beam and provided with a means to turn the said finger against or to the said determined position so as to take up from the said determined connecting mechanism all lost motion.

8. The combination in an indicating caliper with a beam provided with terminal contact points one of which is operatively responsive to indicate in both directions upon a dial secured to said beam, of said dial having a centrally mounted gudgeon with an indicating finger rigidly attached to said gudgeon, an interposed linear train of gearing from said responsive contact point to the said gudgeon and a helical spring attached thereto and to the said beam.

FREDERICK WILLIAM HORSTMANN.

Witnesses:

PETER BANTA, FRANK G. HORSTMANN.

Goplu o! thil patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, 17.0. 

